Here are nine major projects under construction that are not only transforming Boston’s built environment, but providing a real-time gauge of its real estate. How these go, so will likely go the commercial and residential markets overall.

The groundbreaking capped veritable eons of planning and readjustments for what’s become one of Boston’s most anticipated projects. Lead developer John Rosenthal of Meredith had been trying to build at the 4.5-acre site for nearly 20 years.

The infrastructural alchemy inherent in the project, which includes building over the Mass. Pike, as well as financing challenges had delayed it interminably.

2. The Four Seasons Hotel and Private Residences One Dalton Street

The Four Seasons Hotel and Private Residences One Dalton Street—a.k.a. One Dalton—is almost finished, according to developer Carpenter & Company.

Workers with Suffolk Construction have raised the condo and hotel tower to its 60th floor and have been adding about one and a half floors per week. That means it will soon reach its 61st and final floor any minute now.

And, due to myriad reasons that include construction costs, a dearth of sites, and shadows, One Dalton will likely be the last Boston tower—the last New England tower—of more than 700 feet for a long, long while.

One Dalton is due to include 215 Four Seasons hotel rooms that the international hospitality firm will manage and 160 luxury condos (which Four Seasons will also service). The architect is a collaboration between Cambridge Seven Associates and Henry Cobb of Pei Cobb Freed. Cobb, incidentally, designed 200 Clarendon (formerly known as the Hancock).

One Dalton is expected to top off in July, and to start opening in March 2019.

The Boston Planning & Development Agency signed off on the plans in November 2017, capping well over a year of wrangling, in particular because of the shadows it would likely cast. One of its three new towers is expected to reach 364 feet.

Boston Properties reached a deal with opponents concerned about the shadows just before the November vote. The developer will pay $3 million to opponents such as the Old South Church to mitigate the impact and a further $3 million to an affordable housing fund that Boston runs.

The project is envisioned as a kind of transformative gateway connecting Back Bay and the South End; and includes improvements to the station itself.

Ultimately, what’s dubbed the Hub on Causeway will mean more than 1.5 million square feet of shops, restaurants, offices, hotel rooms, and residences, as well as an expansion of nearby TD Garden and transit improvements to North Station.

Phase I is expected to wrap in 2018 (it topped off in January). It includes flourishes such as the city’s largest supermarket; a 15-screen movie theater; 10,000 square feet of outdoor space for a new entrance to TD Garden and North Station; and 175,000 square feet of what the developers are calling “creative office space.”

Phase II will include a 440-unit, 38-floor residential tower and a 260-key, 10-floor micro-hotel; and Phase III is an office tower with a proposed height of 495 feet.

The Hub on Causeway under construction in March 2018. Boston Globe via Getty Images

Dubbed Bulfinch Crossing, The conversion will produce six buildings with 2.9 million square feet total. (Here is a cool timelapse video of part of Government Center Garage being demolished.)

Interestingly, in the summer of 2017, HYM announced that 118 apartments in the project’s 45-story, 486-unit rental tower were going condo instead—likely a nod to Boston’s incandescent sales market. The HYM Investment Group, the developer behind the project, expects to finish that residential tower by 2020.

6. Winthrop Square Garage tower

115 Devonshire St Boston, MA 02109

The Boston Planning & Development Agency in mid-May 2018 approvedthe development of the former Winthrop Square Garage in the Financial District into a 690-foot tower of condos and offices.

The $550 million Omni Boston Seaport Hotel will plant 1,055 rooms on Summer Street across from the Boston Convention and Exhibition Center in the Seaport District.

The project goes back to 2017, when the Massachusetts Port Authority designated a development team that includes Omni Hotels & Resorts to build on a state-owned parcel in order to boost the room count in an area still underserved hospitality-wise—despite the convention center being right there.

The 21-story complex will include 100,000 square feet of meeting and event space of its own, including the largest hotel ballroom in the Seaport District. Interestingly, too, six local nonprofits will share in the hotel’s profits; and the developers pointed out in the spring of 2018 that the Omni inn will create between 700 and 1,000 permanent jobs.

There is one potential snag for the whole affair, which is supposed to be finished in 2020: Money management giant Fidelity Investments has sued the developers over the name. Fidelity’s own Seaport Hotel opened in the neighborhood 20 years ago.

The three-building project is set to have 717 apartments and condos. Its 447 condos will constitute the largest single amount of for-sale housing in the Seaport District. A third tower will have apartments.

EchelonSeaport will include 50,000 square feet of in-house amenities—among them two outdoor pools, a fitness center, and two so-called sky lounges—and a 19,000-square-foot landscaped plaza accessible to the public and 125,000 square feet of restaurants and retail over two levels.

There will also be enough parking in two garages for each condo to have one space.

That was the second key approval the site received toward the start of 2018, with the state expediting an environmental green light for redevelopment there. And the city’s zoning appeals board green-lighted the office-building construction shortly after the BPDA approval.

Come what may, Suffolk Downs developer HYM Investment Group plans to build big, big, big at the juicily located site, near as it is to two Blue Line stops and Logan Airport. With or without Amazon, HYM plans on 16.5 million square feet of new residential, retail, office, hotel, and lab space built out over as long as two decades.

Eleven million square feet of that would go in Boston and 5.5 million in Revere.